The banking sector can said to be the intermediary between lenders and borrowers.
The banks receive funds from lenders at a lower interest rate.... let's say 0.5% per annum and they lend the funds to borrowers at a high interest rate if maybe 15-30.% per annum .
Thats how they make their money.
This is a very good explanation about how it works banks are just a middle man, and while we have been able to get them out of the equation when it comes to transfering our money from one side of the world to the other thanks to bitcoin and other cryptocurrencies we still have to figure out how to take them out of the equation when it comes to lending.